Ticket #4426: there was a NPE (null pointer exception) in yesterday's work of mine

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37029 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4426: the symbol toggle button is better positioned now when the sizes of textfields are different

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37030 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e